travis update - have a build with and without -fno-common

.travis.yml

@@ -2,6 +2,15 @@ language: c
 matrix:
   include:
     - name: linux-xenial-gcc
+      os: linux
+      env: HINTS=linux LUA_VERSION=5.3.5
+      compiler: gcc
+      script:
+        - cd sys/unix/ && sh setup.sh hints/$HINTS && cd ../../
+        - make fetch-lua
+        - test -d "lib/lua-$LUA_VERSION/src" || exit 0
+        - make install
+    - name: linux-nocommon-xenial-gcc
       os: linux
       env: HINTS=linux-travis LUA_VERSION=5.3.5
       compiler: gcc

sys/unix/hints/linux-travis

@@ -35,6 +35,11 @@ CFLAGS+=-DCURSES_GRAPHICS
 #CFLAGS+=-DMSGHANDLER
 #CFLAGS+=-DTTY_TILES_ESCCODES
 
+# when building liblua.a, avoid warning that use of tmpnam() should be
+# replaced by mkstemp(); the lua code doesn't use nethack's config.h so
+# this needs to be passed via make rather than defined in unixconf.h
+SYSCFLAGS=-DLUA_USE_POSIX
+
 LINK=$(CC)
 # Only needed for GLIBC stack trace:
 LFLAGS=-rdynamic